SCHEMA

Element	Name	Min/Max
AK501	Transaction Set Acknowledgement Code	1/1
AK502	Transaction Set Syntax Error Code	1/3
AK503	Transaction Set Syntax Error Code	1/3
AK504	Transaction Set Syntax Error Code	1/3
AK505	Transaction Set Syntax Error Code	1/3
AK506	Transaction Set Syntax Error Code	1/3

AK501 - Transaction Set Acknowledgement Code

Code indicating accept or reject condition based on the syntax editing of the transaction set

Code	Definition
A	Accepted
E	Accepted But Errors Were Noted
M	Rejected, Message Authentication Code (MAC) Failed
R	Rejected
W	Rejected, Assurance Failed Validity Tests
X	Rejected, Content After Decryption Could Not Be Analyzed

Code indicating error found based on the syntax editing of a transaction set

Code	Definition
1	Transaction Set Not Supported
2	Transaction Set Trailer Missing
3	Transaction Set Control Number in Header and Trailer Do Not Match
4	Number of Included Segments Does Not Match Actual Count
5	One or More Segments in Error
6	Missing or Invalid Transaction Set Identifier
7	Missing or Invalid Transaction Set Control Number
8	Authentication Key Name Unknown
9	Encryption Key Name Unknown
10	Requested Service (Authentication or Encrypted) Not Available
11	Unknown Security Recipient
12	Incorrect Message Length (Encryption Only)
13	Message Authentication Code Failed
15	Unknown Security Originator
16	Syntax Error in Decrypted Text
17	Security Not Supported
18	Transaction Set not in Functional Group
19	Invalid Transaction Set Implementation Convention Reference
23	Transaction Set Control Number Not Unique within the Functional Group
24	S3E Security End Segment Missing for S3S Security Start Segment
25	S3S Security Start Segment Missing for S3E Security End Segment
26	S4E Security End Segment Missing for S4S Security Start Segment
27	S4S Security Start Segment Missing for S4E Security End Segment

rev 3/3/2025